Friction in rough contacts of linear viscoelastic surfaces with anisotropic statistical properties Luciano Afferrante, Carmine Putignano, Nicola Menga and Giuseppe Carbone Eur. Phys. J. E, 42 6 (2019) 80 Published online: 27 June 2019 DOI: 10.1140/epje/i2019-11844-5